VCW GB 242 EH The problem started last night, the heating came on (mode selected is summer hot water only), tried a few things and it went off. Missus phones me today - it's on again and with the temp dial at 1 the rads are steaming hot!. told her to shut off the main switch.. Got home this afternoon to give it a poke and a prod and can't find anything obvious as to why it would be doing this. So now we have to fire it up for hot water then switch it all off again. Your help and advice would be greatly appreciated, thanks